slovodefinícia
extended memory
(foldoc)		extended memory

Memory above the first megabyte of address space
in an IBM PC with an 80286 or later processor.

Extended memory is not directly available in real mode, only
through EMS, UMB, XMS, or HMA; only applications
executing in protected mode can use extended memory
directly. In this case, the extended memory is provided by a
supervising protected-mode operating system such as
Microsoft Windows. The processor makes this memory
available through a system of global descriptor tables and
local descriptor tables. The memory is "protected" in the
sense that memory assigned a local descriptor cannot be
accessed by another program without causing a hardware trap.
This prevents programs running in protected mode from
interfering with each other's memory.

A protected-mode operating system such as Windows can also
run real-mode programs and provide expanded memory to
them. DOS Protected Mode Interface is Microsoft's
prescribed method for an MS-DOS program to access extended
memory under a multitasking environment.

Having extended memory does not necessarily mean that you have
more than one megabyte of memory since the reserved memory
area may be partially empty. In fact, if your 386 or higher
uses extended memory as expanded memory then that part is not
in excess of 1Mb.

See also conventional memory.

(1996-01-10)
podobné slovodefinícia
extended memory manager
(foldoc)		extended memory manager

(XMM) The memory manager software
implementing Extended Memory Specification, such as HIMEM
or QEMM386. XMM's can usually also act as A20 handlers.

(1996-01-10)
extended memory specification
(foldoc)		Extended Memory Specification

(XMS) The specification describing the use of {IBM
PC} extended memory in real mode for storing data (but not
executable code). Memory is made available by {extended
memory manager} (XMM) software. The XMM functions are
accessible through interrupt 2FH.

(1996-01-10)

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